Anti-clogging ureteral guide sheath

Abstract

This utility model discloses an anti-blockage ureteral guide sheath, belonging to the field of medical device technology. It includes a guide sheath and a negative pressure connector. The guide sheath has a port at its front end, the inner diameter of which is smaller than the inner diameter of the guide sheath. Side suction ports are evenly distributed on the outer side of the front end of the guide sheath. Valves are evenly distributed circumferentially on the inner wall of the guide sheath between the port and the side suction ports. The sides of the valves are closely fitted together and inclined towards the rear end of the guide sheath. This utility model, by evenly distributing valves circumferentially at the front end of the guide sheath, with the valves forming a cone shape with their tips pointing towards the rear end of the guide sheath, allows the valves to unfold outwards after the flexible endoscope is inserted into the guide sheath. The valves support the front end of the flexible endoscope, ensuring it is centered at the end of the guide sheath and equidistant from the side suction ports. This effectively prevents long and irregular particles from entering the guide sheath through the side suction ports, effectively preventing blockage during the suction of small stone fragments.

Description

Technical Field

[0001] This utility model relates to a ureteral sheath, and more particularly to an anti-blockage ureteral sheath, belonging to the field of medical device technology. Background Technology

[0002] A ureteral sheath is a medical device widely used in urological surgeries and examinations. It is mainly a long, thin tubular structure, usually made of plastic or other medical materials. Its function is to provide a passage for instruments such as ureteroscopes to enter the ureter and to drain urine and substances produced during surgery (such as stone fragments, blood, etc.).

[0003] In the prior art, such as the utility model with application number 202321695166.0, a ureteral guiding sheath is disclosed. One end of the guiding sheath body adopts a bevel design. When it reaches the lesion location, the bevel design of the guiding sheath body increases the surface area in contact with the stone, making it more likely to come into contact with the stone. During the negative pressure stone expulsion process, it can more quickly draw the fragments into the ureteral guiding sheath and expel them from the body, thus solving the problem of low efficiency in expelling fragments from the ureteral guiding sheath in the prior art.

[0004] The above applications still have shortcomings:

[0005] When the flexible endoscope is inside the suction sheath to perform negative pressure suction of fine gravel, the front end of the flexible endoscope may be close to one side of the suction sheath, resulting in different distances between the side holes and the suction sheath. Irregular particles with larger inner diameters may enter the interior of the suction sheath through the side holes, causing blockages during the transport process inside the suction sheath. Moreover, the gravel particles are large, and small shaking of the flexible endoscope is not enough to clear the gravel, requiring the flexible endoscope to be completely removed, which is very inconvenient. In addition, the inner diameter of the bevel at the front end of the suction sheath is the same as the inner diameter of the suction sheath. During the extraction of large gravel particles, even if they can enter the interior of the suction sheath, if the gravel changes its orientation during the suction process, there is a high probability that it will get stuck inside the suction sheath, causing blockages.

[0006] To address this issue, an anti-blockage ureteral sheath was designed. Utility Model Content

[0007] The main objective of this invention is to provide an anti-blockage ureteral sheath to solve the problems mentioned in the background art.

[0008] The objective of this utility model can be achieved by adopting the following technical solution:

[0009] A ureteral guide sheath for preventing blockage includes a guide sheath and a negative pressure connector. The guide sheath has a port at its front end, the inner diameter of which is smaller than the inner diameter of the guide sheath. Side suction ports are uniformly provided on the outer side of the front end of the guide sheath. Valves are uniformly provided circumferentially on the inner wall of the guide sheath between the port and the side suction ports. The sides of the valves are attached to each other and inclined toward the rear end of the guide sheath.

[0010] Preferably, the rear end of the guide sheath is provided with a sealing cap, and the sealing cap is suspended on the guide sheath.

[0011] Preferably, an arc-shaped guide edge is provided between the port and the inner wall of the guide sheath, and the end of the guide sheath is arc-shaped.

[0012] Preferably, the side suction port has an opening on its outer side, and the opening is funnel-shaped.

[0013] Preferably, there are four sets of side suction ports, and the distance between the side suction ports is the same.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model features valves evenly arranged circumferentially at the front end of the guide sheath, with the valves fitting together to form a cone shape with the tip pointing towards the rear end of the guide sheath. After the flexible endoscope passes through the guide sheath, the valves unfold outward, supporting the front end of the flexible endoscope and ensuring that the front end of the flexible endoscope is located at the center of the end of the guide sheath and is at the same distance from the side suction port. This effectively prevents long and irregular particles from entering the interior of the guide sheath through the side suction port, and effectively prevents blockage when small particles of gravel are suctioned.

[0016] 2. The inner diameter of the port at the front end of the guide sheath of this utility model is smaller than the inner diameter of the guide sheath. This can prevent the guide sheath from becoming blocked due to the change in orientation of large particles of gravel during the suction process. In addition, after the flexible endoscope is pulled out, the negative pressure will control the valve deformation to block the side suction port, thereby increasing the suction force at the front end of the guide sheath and increasing the suction rate of gravel. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is a cross-sectional view of the end of the guide sheath in its initial state according to this utility model;

[0019] Figure 3 This is a cross-sectional view of the end of the guide sheath in the negative pressure extraction state of small-particle crushed stone according to this utility model;

[0020] Figure 4 This is a cross-sectional view of the end of the guide sheath in the negative pressure extraction state of large-particle crushed stone according to this utility model.

[0021] In the diagram: 1. Guide sheath; 2. Negative pressure connector; 3. Sealing cap; 4. Port; 5. Side suction port; 6. Valve; 7. Arc-shaped guide edge; 8. Opening. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0023] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Example 1

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes an anti-blockage ureteral guide sheath, including a guide sheath 1 and a negative pressure connector 2. The front end of the guide sheath 1 has a port 4, the inner diameter of the port 4 is smaller than the inner diameter of the guide sheath 1. Side suction ports 5 are evenly provided on the outer side of the front end of the guide sheath 1. Valves 6 are evenly provided circumferentially on the inner wall of the guide sheath 1 between the port 4 and the side suction ports 5. The sides of the valves 6 are attached to each other and inclined toward the rear end of the guide sheath 1.

[0029] During stone removal, the inner core is inserted into the guiding sheath 1 and inserted along the ureter into the patient's body. The inner core is then removed, and the rear end of the guiding sheath 1 is sealed. Simultaneously, the suction device is connected to the negative pressure connector 2. The flexible endoscope is then inserted into the guiding sheath 1 to locate the stone. The guiding sheath 1 and the flexible endoscope are then simultaneously brought close to the stone for lithotripsy. As the flexible endoscope is withdrawn from the guiding sheath 1, it compresses and expands the valve 6 towards the anterior end. At this point, the flexible endoscope is positioned in the middle of the anterior end of the guiding sheath 1, with the side suction port 5 and the flexible endoscope... The spacing between them is the same, and the diameter of the side suction port 5 is the same as the distance from the side suction port 5 to the side of the flexible endoscope. During the suction of small particles of gravel, the small particles of gravel enter the interior of the guide sheath 1 through the gap of the valve 6 at the port 4 and the side suction port 5, and then are discharged from the negative pressure connector 2. When large particles of gravel are extracted, the flexible endoscope is pulled out, the valve 6 loses the squeezing force and resets first, and then due to the suction force generated by the negative pressure, the valve 6 moves closer to the side suction port 5 and causes a certain blockage to the side suction port 5. The suction force at the port 4 increases, and the large particles of gravel enter the interior of the guide sheath 1 from the port 4 and are discharged.

[0030] Example 2

[0031] The solution in Example 1 will be further described below with reference to its specific working method.

[0032] like Figure 1 As shown, in a preferred embodiment, based on the above method, a sealing cap 3 is provided at the rear end of the guide sheath 1, and the sealing cap 3 is suspended on the guide sheath 1.

[0033] After the guide sheath 1 is inserted into the designated position, the inner core of the sheath is pulled out, and then the rear end of the guide sheath 1 is sealed with a sealing cap 3. The center of the sealing cap 3 has a round hole through which the flexible lens is inserted into the interior of the guide sheath 1.

[0034] like Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, an arc-shaped guide edge 7 is provided between the port 4 and the inner wall of the guide sheath 1, and the end of the guide sheath 1 is arc-shaped.

[0035] The arc-shaped design of the outer end of the guide sheath 1 will not cause damage to the ureteral mucosa, while the arc-shaped guide edge 7 facilitates the insertion of the sheath core and flexible endoscope.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, in a preferred embodiment, based on the above method, the side suction port 5 is further provided with an opening 8 on the outside, and the opening 8 is formed in a funnel shape.

[0037] Due to the design of the external opening 8 of the side suction port 5, it is effectively prevented that gravel particles will clog the side suction port 5.

[0038] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, four sets of side suction ports 5 are further provided, and the distance between the side suction ports 5 is the same.

[0039] With multiple sets of side suction ports 5, small particles of gravel can be quickly sucked up.

[0040] Example 3

[0041] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0042] During stone removal, the inner core is inserted into the guide sheath 1 and inserted along the ureter into the patient's body. The inner core is then removed, and the rear end of the guide sheath 1 is sealed with a sealing cap 3. The sealing cap 3 has a circular hole in its center for the flexible endoscope to pass through. The flexible endoscope is inserted into the guide sheath 1 through this hole. Simultaneously, the suction device is connected to the negative pressure connector 2. After the flexible endoscope enters the patient's body, the stone is located. Then, the guide sheath 1 and the flexible endoscope are simultaneously brought close to the stone for lithotripsy. When the flexible endoscope is withdrawn from the guide sheath 1, the valve 6 is squeezed and opened towards the front. At this point, the flexible endoscope is located in the middle of the front end of the guide sheath 1, with the side suction port 5 at the same distance from the flexible endoscope. The diameter is the same as the distance from the side suction port 5 to the side of the flexible endoscope. During the suction of small particles of lithotripsy, the small particles of lithotripsy enter the interior of the guide sheath 1 through the gap of the valve 6 at port 4 and the side suction port 5, and then are discharged from the negative pressure connector 2. Due to the design of the external opening 8 of the side suction port 5, it is effectively prevented that the lithotripsy particles will block the side suction port 5. Moreover, with the setting of multiple sets of side suction ports 5, small particles of lithotripsy can be quickly suctioned. When large particles of lithotripsy are extracted, the flexible endoscope is pulled out. The valve 6 loses the squeezing force and resets first. Then, due to the suction force generated by the negative pressure, the valve 6 moves closer to the side suction port 5 and blocks the side suction port 5. The suction force at port 4 increases, and the large particles of lithotripsy enter the interior of the guide sheath 1 from port 4 and are discharged.

[0043] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A ureteral guide sheath for preventing blockage, comprising a guide sheath (1) and a negative pressure connector (2), characterized in that: The front end of the guide sheath (1) is provided with a port (4), the inner diameter of the port (4) is smaller than the inner diameter of the guide sheath (1), and the outer side of the front end of the guide sheath (1) is provided with side suction ports (5). The inner wall of the guide sheath (1) and the side suction ports (5) are provided with valves (6) in a circumferential direction. The sides of the valves (6) are attached to each other and inclined towards the rear end of the guide sheath (1).

2. The ureteral sheath for preventing blockage according to claim 1, characterized in that: The rear end of the guide sheath (1) is provided with a sealing cap (3), and the sealing cap (3) is suspended on the guide sheath (1).

3. The ureteral sheath for preventing blockage according to claim 1, characterized in that: An arc-shaped guide edge (7) is provided between the port (4) and the inner wall of the guide sheath (1), and the end of the guide sheath (1) is arc-shaped.

4. The ureteral sheath for preventing blockage according to claim 1, characterized in that: The side suction port (5) has an opening (8) on its outer side, and the opening (8) is funnel-shaped.

5. The ureteral sheath for preventing blockage according to claim 1, characterized in that: There are four sets of side suction ports (5), and the distance between the side suction ports (5) is the same.

Images